Echo Express SE I - Compact Desktop Thunderbolt Expansion System for Three PCIe Cards
Pro Performance.
Compact Design.
Pro Performance. Compact Design.

Echo Express SE IIIe

3-slot Desktop Thunderbolt to PCIe Card Expansion System for Computers with Thunderbolt 4 or Thunderbolt 3 Ports

Connect Three Full-height, Half-length+ PCIe Cards

Although Mac®, Windows®, and Linux® computers with Thunderbolt™ 4 or Thunderbolt 3 ports offer processing power to spare, for many users (such as pros in the creative fields) onboard processing power alone is not enough. The computers lack the PCIe expansion slots needed to install specialty cards that add video and audio inputs, transcode data, and connect to high-speed shared storage and networks. Sonnet’s Echo™ Express SE IIIe is a compact, desktop Thunderbolt to PCIe card expansion system that enables you to connect three professional PCIe cards to your computer at the same time, via a single Thunderbolt cable.

Echo Express SE III with MacBook Pro
PCIe Card Connected to Thunderbolt Computer

The Thunderbolt Connection

Plugged into one of your computer’s Thunderbolt 4 or Thunderbolt 3 ports, this compact desktop expansion system supports three professional PCIe cards (video capture; audio DSP; 6Gb or 12Gb SAS or SATA host bus adapter; 10Gb or 25Gb, Ethernet; or RAID controller).

Why Thunderbolt 3 Instead of Thunderbolt 4?
Sonnet’s Thunderbolt to PCIe card expansion systems rely on Thunderbolt 3 technology for maximum performance. Learn Why ›
Mac Studio Compatible

Key Features

Connect PCIe Cards Icon

Connect PCIe Cards

Use multiple high-performance PCIe cards with computers with a Thunderbolt 4 or Thunderbolt 3 port.

Three PCIe 3.0 x8 Slots Icon

Three PCIe 3.0 x8 Slots

Supports three full-height, half-length+ (up to 7.75 inches long), single-width cards, or one double-width card plus one single-width card.

40Gbps Thunderbolt System Icon

40Gbps Thunderbolt System

Offers full PCIe bandwidth to the installed card. Learn more about Thunderbolt 3 performance benefits over Thunderbolt 4.

Pro Performance, Compact Design Icon

Pro Performance. Compact Design.

Takes up little space on the desktop, but large enough to support nearly every Thunderbolt-compatible non-GPU PCIe card at full performance.

Two Thunderbolt Ports Icon

Two Thunderbolt Ports

One port connects to computer; second port supports daisy-chaining of up to five additional Thunderbolt peripheral devices.

Remarkably Quiet Icon

Remarkably Quiet

Temperature-controlled, variable-speed fan automatically and quietly cools the cards.

Energy Saver Mode Icon

Energy Saver Mode

Powers on/off automatically with the computer.

Rugged Aluminum Housing Icon

Rugged Aluminum Housing

Provides robust and secure protection.

Pro Power Icon

Pro Power

Auxiliary PCIe power connector for a power-hungry card; daisy chain port provides up to 15W of power to connected peripherals.

Apple M Series Compatible Icon

Apple® M series Compatible

Supports M series Macs (with PCIe cards that have compatible drivers).

Intel Mac and Windows Compatible Icon

Intel® Mac & Windows Compatible

Supports Intel Macs with Thunderbolt 3 ports and Thunderbolt 2 ports (with adapter and Thunderbolt 2 cable, both sold separately); and Windows 10 computers with Thunderbolt 3 ports.

Linux Compatible Icon

Linux Compatible

Supports Linux computers with Thunderbolt 4 and Thunderbolt 3 ports.

Free Lifetime Tech Support
PCIe Cards

Nearly Every Thunderbolt-Compatible, Non-GPU PCIe Card Supported

Smaller than the 3-slot Echo III Desktop, the Echo Express SE IIIe is still large enough to support nearly every Thunderbolt compatible, non-GPU card available. With its three x8 slots, the SE IIIe supports PCIe 4.0, 3.0, PCIe 2.0, and PCIe 1.1 cards up to 7.75 inches long. Do you have a card in mind but aren’t sure it’s compatible? We’ve put together a compatibility list that identifies cards conforming to Thunderbolt technology requirements, and organized by fit and power compatibility with specific expansion systems.

Echo Express SE III Icon

Design Smarts

Aluminum Enclosure. Auto Power On/Off.

The inside of the Echo Express SE IIIe is wrapped in a rugged, yet lightweight aluminum outer shell, resulting in a lightweight system small enough to carry in your backpack, yet durable enough to protect the installed PCIe cards securely. Since Echo Express products automatically power on and off with your computer, there is no power switch on the chassis, ensuring you don’t waste energy by forgetting to turn it off.

Three PCIe 3.0 Slots for Demanding Professional Needs

Echo Express SE IIIe’s PCIe 3.0 x8 slots support three half-length+, full-height, single-width PCIe cards, or one single-width card plus one double-width card.

Double-width?

Some specialty cards, such as RME’s HDSPe MADI FX, Blackmagic Design’s DeckLink 4K Extreme, and the Lynx AES16e 50, include a daughter card that mates with and provides additional external connections to the main card.

Power to Spare

Echo Express SE IIIe includes an auxiliary PCIe power connector, enabling you to install a card requiring extra power, such as the AJA® Kona® 5 or Blackmagic DeckLink 4K Extreme 12G, and Bluefish444’s Epoch and KRONOS SDI cards.

Echo Express SE III PCIe Card Size Support
Echo Express SE IIIe (Interior View)

1. Three PCIe 3.0 x8 slots
2. 6-pin auxiliary power connector

Fan Icon

Ultra-quiet Operation

Featuring a Noctua NF-R8 redux-1800 fan, the Echo Express SE IIIe is designed to deliver ultra-quiet operation so that it can be comfortably used in noise-sensitive environments. Rated at 17.1dBA — below the 20dBA ceiling prescribed for use in recording and broadcast studios — the fans spreads the spectrum of its noise to minimize the impact at any single frequency. To further ensure negligible noise levels, the fan is temperature-controlled, automatically speeding up and slowing down smoothly as needed, and the Echo system enclosure is engineered to optimize airflow over the installed cards to effectively and efficiently cool the system.
The Secure Connection for High Performance

40Gbps Thunderbolt Cable and ThunderLok 3 Included

Sonnet includes a Thunderbolt cable that supports Thunderbolt’s full 40Gbps bandwidth, and is fully compatible with Thunderbolt 4 and Thunderbolt 3 computers. Sonnet also provides a ThunderLok™ 3 Thunderbolt connector retainer clip that prevents accidental cable disconnections — just slide it over one end of the cable, and then plug in the connector and secure it to the chassis by turning a thumbscrew. Because of its unique design, ThunderLok remains on the cable so it won’t get lost when not in use.
Thunderbolt Cable with ThunderLok 3Supports Full 40Gbps Thunderbolt Bandwidth Icon

40Gbps Thunderbolt

Fastest External Interface Available

The Echo Express SE IIIe features a 40Gbps Thunderbolt interface that delivers up to 2800 MB/s of PCIe bandwidth, enabling it to support 4K video capture and processing cards at high frame rates, and 16Gb FC cards and dual-port 10GbE cards at full performance.

Thunderbolt 40Gbps Ports Icons
Dual 40Gbps Thunderbolt Ports
One port is reserved for the connection to your Thunderbolt 4 or Thunderbolt 3 computer; the second port enables expansion of up to five additional Thunderbolt peripheral devices in a daisy chain.
10Gbps USB 3.1 Gen 2 Icon
10Gbps USB 3.2 Gen 2 Support
10Gbps USB 3.2 Gen 2 support allows you to connect a USB device to the second Thunderbolt port using the proper cable or adapter.
15W Power Icon
Provides 15W of Power
For peripherals requiring the need for extra power, 15 watts is provided to bus-powered devices.
4K & 5K Display Icon
Supports Connecting One 5K 60Hz Display
Maximize the utilization of one computer Thunderbolt port.
Thunderbolt 4 Computers

Compatible with Thunderbolt 4 Computers and Apple M series Macs

Echo Express SE IIIe is fully compatible with Thunderbolt 4 computers, including Apple M series Macs. Sonnet Thunderbolt expansion systems are purposely designed with a Thunderbolt 3 controller and its four lanes of PCIe (not available in a Thunderbolt 4 peripheral) to achieve maximum simultaneous ingest speeds. Learn more about the performance benefits of Thunderbolt 3 over Thunderbolt 4.
Apple M Series CPU

Compatible with Apple M series Macs

see Tech Specs for details

Older Macs with Thunderbolt 2 Ports

Backward Compatible with Older Macs

No Thunderbolt 4 or Thunderbolt 3? No problem — the Echo Express SE IIIe is also compatible with Macs with Thunderbolt 2 or Thunderbolt ports when used with the bi-directional Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter and a Thunderbolt cable (both sold separately).
Learn why Sonnet’s Pro Products Rely on Thunderbolt 3 Technology for Maximum Performance
See Tech Specs for footnotes.
Product specifications and information subject to change without notice. Computer hardware and accessories featured in photos that are not included with product are shown for illustration purposes; items sold separately.

Echo Express SE IIIe